How to draw a reference line on chart?

[kiran]

Hi All,

Can any one please tell me how to draw a reference line at a point on Y-axis?like a threshold line at threshold point.

exact requirement:

i need to draw a horizontal reference line parallel to X-axis like suppose at point 3 on y-axis i need to draw a cut-off line which should be parallel to the x-axis like

Y-axis
|
|
|3-----------------------------------------------------
|
|
|
------------------------------------------------------- X-axis 

is this possible? if so please share some sample code.

Thanks in advance.

regards,
kiran

[Jane]

Hi Kiran,

you can use Scale breaks to implement this feature. I am not sure. you can check with telerik people.

regards,
jane

[Dwight]

Hi Kirian,

There are two approaches I can suggest. The first one is using marked areas:

	ChartMarkedZone zone = new ChartMarkedZone("zone 1");
	zone.ValueStartY = 20d;
	zone.ValueEndY = 20.5d;
	zone.Appearance.FillStyle.MainColor = Color.FromArgb(128, Color.Red);
	this.radChart1.PlotArea.MarkedZones.Add(zone);

These marked areas, however, show beneath the series. If you require the reference line to be on top of the rest, I suggest adding a line series using the same values for all Items, or adding only two items, but setting their X values:

	ChartSeries referenceSeries = new ChartSeries("Reference line", ChartSeriesType.Line, this.radChart1.Series);
	referenceSeries.Items.Add(new ChartSeriesItem(0, 10));
	referenceSeries.Items.Add(new ChartSeriesItem(4, 10));
	referenceSeries.Appearance.LabelAppearance.Visible = false;
	referenceSeries.Appearance.FillStyle.MainColor = Color.Red;
	this.radChart1.Series.Add(referenceSeries);

Should you need further help, do not hesitate to write us back.

Regards,
Evtim
the Telerik team

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